The nurse is caring for a client following the insertion of a Nexplanon rod. Which priority instruction should the nurse provide this client?

A. Following the insertion of the Nexplanon rod, it is important to inform the client that backup contraception methods are needed for the first 24 hours to ensure pregnancy prevention while the implant becomes effective. B. While smoking cessation is advised due to the increased risk of thrombotic events with hormonal contraceptives, it is not the priority instruction immediately following the insertion of Nexplanon. C. The statement regarding weight loss is incorrect; Nexplanon is more commonly associated with weight gain rather than loss, so advising clients on calorie consumption is misleading. D. Although Nexplanon has a high efficacy rate in preventing pregnancy, stating a prevention rate of 100% is inaccurate and misleading, as no contraceptive method is completely foolproof.